Thermodynamic and Spectroscopic Study of Vinylidene Chloride. I. Thermodynamic Properties of the Solid, Liquid, and Ideal Gas

Abstract

The low-temperature heat capacity, heat of vaporization, and vapor pressure of vinylidene chloride have been measured. Data obtained from these measurements are as follows: the heat capacity of the solid from 13 to 150°K; the liquid heat capacity from 150 to 290°K; the heat of fusion, 1557 cal mole—1, at the melting point, 150.59°K; the entropy of the liquid at 298.15°K, 48.17 cal mole—1 deg—1; the heat of vaporization at 298.15°K, 6328 cal mole—1; and the vapor pressure, log10P(mm)=6.98200−1104.29/(t+237.70). The entropy of the ideal gas, evaluated from the calorimetric data, is in agreement with the entropy calculated from spectroscopic and molecular data. Thermodynamic properties of the solid, liquid, and ideal gas have been tabulated at selected temperatures.